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        <li class="chapter " data-level="1.1" data-path="../">
            
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                    Introduction
            
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                    欢迎使用 Swift
            
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                    Swift 教程
            
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                    泛型
            
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                    类型
            
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                    表达式
            
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                    语句
            
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                    声明
            
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                                <h1 id="&#x5173;&#x4E8E;-swift">&#x5173;&#x4E8E; Swift</h1>
<p>Swift &#x662F;&#x4E00;&#x79CD;&#x975E;&#x5E38;&#x597D;&#x7684;&#x7F16;&#x5199;&#x8F6F;&#x4EF6;&#x7684;&#x65B9;&#x5F0F;&#xFF0C;&#x65E0;&#x8BBA;&#x662F;&#x624B;&#x673A;&#xFF0C;&#x53F0;&#x5F0F;&#x673A;&#xFF0C;&#x670D;&#x52A1;&#x5668;&#xFF0C;&#x8FD8;&#x662F;&#x5176;&#x4ED6;&#x8FD0;&#x884C;&#x4EE3;&#x7801;&#x7684;&#x8BBE;&#x5907;&#x3002;&#x5B83;&#x662F;&#x4E00;&#x79CD;&#x5B89;&#x5168;&#xFF0C;&#x5FEB;&#x901F;&#x548C;&#x4E92;&#x52A8;&#x7684;&#x7F16;&#x7A0B;&#x8BED;&#x8A00;&#xFF0C;&#x5C06;&#x73B0;&#x4EE3;&#x7F16;&#x7A0B;&#x8BED;&#x8A00;&#x7684;&#x7CBE;&#x534E;&#x548C;&#x82F9;&#x679C;&#x5DE5;&#x7A0B;&#x5E08;&#x6587;&#x5316;&#x7684;&#x667A;&#x6167;&#xFF0C;&#x4EE5;&#x53CA;&#x6765;&#x81EA;&#x5F00;&#x6E90;&#x793E;&#x533A;&#x7684;&#x591A;&#x6837;&#x5316;&#x8D21;&#x732E;&#x7ED3;&#x5408;&#x4E86;&#x8D77;&#x6765;&#x3002;&#x7F16;&#x8BD1;&#x5668;&#x5BF9;&#x6027;&#x80FD;&#x8FDB;&#x884C;&#x4E86;&#x4F18;&#x5316;&#xFF0C;&#x7F16;&#x7A0B;&#x8BED;&#x8A00;&#x5BF9;&#x5F00;&#x53D1;&#x8FDB;&#x884C;&#x4E86;&#x4F18;&#x5316;&#xFF0C;&#x4E24;&#x8005;&#x4E92;&#x4E0D;&#x5E72;&#x6270;&#xFF0C;&#x9C7C;&#x4E0E;&#x718A;&#x638C;&#x517C;&#x5F97;&#x3002;</p>
<p>Swift &#x5BF9;&#x4E8E;&#x521D;&#x5B66;&#x8005;&#x6765;&#x8BF4;&#x4E5F;&#x5F88;&#x53CB;&#x597D;&#x3002;&#x5B83;&#x662F;&#x7B2C;&#x4E00;&#x4E2A;&#x65E2;&#x6EE1;&#x8DB3;&#x5DE5;&#x4E1A;&#x6807;&#x51C6;&#x53C8;&#x50CF;&#x811A;&#x672C;&#x8BED;&#x8A00;&#x4E00;&#x6837;&#x5145;&#x6EE1;&#x8868;&#x73B0;&#x529B;&#x548C;&#x8DA3;&#x5473;&#x7684;&#x7CFB;&#x7EDF;&#x7F16;&#x7A0B;&#x8BED;&#x8A00;&#x3002;&#x5B83;&#x652F;&#x6301;&#x4EE3;&#x7801;&#x9884;&#x89C8;&#xFF08;playgrounds&#xFF09;&#xFF0C;&#x8FD9;&#x4E2A;&#x9769;&#x547D;&#x6027;&#x7684;&#x7279;&#x6027;&#x53EF;&#x4EE5;&#x5141;&#x8BB8;&#x7A0B;&#x5E8F;&#x5458;&#x5728;&#x4E0D;&#x7F16;&#x8BD1;&#x548C;&#x8FD0;&#x884C;&#x5E94;&#x7528;&#x7A0B;&#x5E8F;&#x7684;&#x524D;&#x63D0;&#x4E0B;&#x8FD0;&#x884C; Swift &#x4EE3;&#x7801;&#x5E76;&#x5B9E;&#x65F6;&#x67E5;&#x770B;&#x7ED3;&#x679C;&#x3002;</p>
<p>Swift &#x901A;&#x8FC7;&#x91C7;&#x7528;&#x73B0;&#x4EE3;&#x7F16;&#x7A0B;&#x6A21;&#x5F0F;&#x6765;&#x907F;&#x514D;&#x5927;&#x91CF;&#x5E38;&#x89C1;&#x7F16;&#x7A0B;&#x9519;&#x8BEF;&#xFF1A;</p>
<ul>
<li>&#x53D8;&#x91CF;&#x59CB;&#x7EC8;&#x5728;&#x4F7F;&#x7528;&#x524D;&#x521D;&#x59CB;&#x5316;&#x3002;</li>
<li>&#x68C0;&#x67E5;&#x6570;&#x7EC4;&#x7D22;&#x5F15;&#x8D85;&#x51FA;&#x8303;&#x56F4;&#x7684;&#x9519;&#x8BEF;&#x3002;</li>
<li>&#x68C0;&#x67E5;&#x6574;&#x6570;&#x662F;&#x5426;&#x6EA2;&#x51FA;&#x3002;</li>
<li>&#x53EF;&#x9009;&#x503C;&#x786E;&#x4FDD;&#x660E;&#x786E;&#x5904;&#x7406; <code>nil</code> &#x503C;&#x3002;</li>
<li>&#x5185;&#x5B58;&#x88AB;&#x81EA;&#x52A8;&#x7BA1;&#x7406;&#x3002;</li>
<li>&#x9519;&#x8BEF;&#x5904;&#x7406;&#x5141;&#x8BB8;&#x4ECE;&#x610F;&#x5916;&#x6545;&#x969C;&#x63A7;&#x5236;&#x6062;&#x590D;&#x3002;</li>
</ul>
<p>Swift &#x4EE3;&#x7801;&#x88AB;&#x7F16;&#x8BD1;&#x548C;&#x4F18;&#x5316;&#xFF0C;&#x4EE5;&#x5145;&#x5206;&#x5229;&#x7528;&#x73B0;&#x4EE3;&#x786C;&#x4EF6;&#x3002;&#x8BED;&#x6CD5;&#x548C;&#x6807;&#x51C6;&#x5E93;&#x662F;&#x57FA;&#x4E8E;&#x6307;&#x5BFC;&#x539F;&#x5219;&#x8BBE;&#x8BA1;&#x7684;&#xFF0C;&#x7F16;&#x5199;&#x4EE3;&#x7801;&#x7684;&#x660E;&#x663E;&#x65B9;&#x5F0F;&#x4E5F;&#x5E94;&#x8BE5;&#x662F;&#x6700;&#x597D;&#x7684;&#x3002;&#x5B89;&#x5168;&#x6027;&#x548C;&#x901F;&#x5EA6;&#x7684;&#x7ED3;&#x5408;&#x4F7F;&#x5F97; Swift &#x6210;&#x4E3A;&#x4ECE; &#x201C;Hello&#xFF0C;world&#xFF01;&#x201D; &#x5230;&#x6574;&#x4E2A;&#x64CD;&#x4F5C;&#x7CFB;&#x7EDF;&#x7684;&#x7EDD;&#x4F73;&#x9009;&#x62E9;&#x3002;</p>
<p>Swift &#x5C06;&#x5F3A;&#x5927;&#x7684;&#x7C7B;&#x578B;&#x63A8;&#x7406;&#x548C;&#x6A21;&#x5F0F;&#x5339;&#x914D;&#x4E0E;&#x73B0;&#x4EE3;&#x8F7B;&#x5DE7;&#x7684;&#x8BED;&#x6CD5;&#x76F8;&#x7ED3;&#x5408;&#xFF0C;&#x4F7F;&#x590D;&#x6742;&#x7684;&#x60F3;&#x6CD5;&#x80FD;&#x591F;&#x4EE5;&#x6E05;&#x6670;&#x7B80;&#x6D01;&#x7684;&#x65B9;&#x5F0F;&#x8868;&#x8FBE;&#x3002;&#x56E0;&#x6B64;&#xFF0C;&#x4EE3;&#x7801;&#x4E0D;&#x4EC5;&#x66F4;&#x5BB9;&#x6613;&#x7F16;&#x5199;&#xFF0C;&#x800C;&#x4E14;&#x6613;&#x4E8E;&#x9605;&#x8BFB;&#x548C;&#x7EF4;&#x62A4;&#x3002;</p>
<p>Swift &#x5DF2;&#x7ECF;&#x8FDB;&#x884C;&#x4E86;&#x591A;&#x5E74;&#xFF0C;&#x5E76;&#x4E14;&#x968F;&#x7740;&#x65B0;&#x7279;&#x6027;&#x548C;&#x529F;&#x80FD;&#x7684;&#x4E0D;&#x65AD;&#x53D1;&#x5C55;&#x3002;&#x6211;&#x4EEC;&#x5BF9; Swift &#x7684;&#x76EE;&#x6807;&#x662F;&#x96C4;&#x5FC3;&#x52C3;&#x52C3;&#x7684;&#x3002;&#x6211;&#x4EEC;&#x8FEB;&#x4E0D;&#x53CA;&#x5F85;&#x60F3;&#x770B;&#x5230;&#x4F60;&#x7528;&#x5B83;&#x521B;&#x5EFA;&#x51FA;&#x7684;&#x4E1C;&#x897F;&#x3002;</p>

                                
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